<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格全选</title>
    <style>
        table{
            border: 1px solid;
            width: 500px;
            margin-left: 30%;
        }

        td,th{
            text-align: center;
            border: 1px solid;
        }
        div{
            margin-top: 10px;
            margin-left: 30%;
        }
        .out{
            background-color: white;
        }
        .over{
            background-color: pink;
        }
    </style>



</head>
<body>

<table>
    <caption>学生信息表</caption>
    <tr>
        <th><input type="checkbox" name="cb" id="firstCheckBox"></th>
        <th>编号</th>
        <th>姓名</th>
        <th>性别</th>
        <th>操作</th>
    </tr>

    <tr>
        <td><input type="checkbox" name="cb" ></td>
        <td>1</td>
        <td>令狐冲</td>
        <td>男</td>
        <td><a href="javascript:void(0);">删除</a></td>
    </tr>

    <tr>
        <td><input type="checkbox" name="cb"></td>
        <td>2</td>
        <td>任我行</td>
        <td>男</td>
        <td><a href="javascript:void(0);">删除</a></td>
    </tr>

    <tr>
        <td><input type="checkbox" name="cb"></td>
        <td>3</td>
        <td>岳不群</td>
        <td>?</td>
        <td><a href="javascript:void(0);">删除</a></td>
    </tr>

</table>
<div>
    <input type="button" id="selectAll" value="全选">
    <input type="button" id="unSelectAll" value="全不选">
    <input type="button" id="selectRev" value="反选">
</div>

</body>
<script>
    document.getElementById("selectAll").onclick=function(){
        var checkBoxes=document.getElementsByName("cb");
        for(var i=0;i<checkBoxes.length;i++){
            checkBoxes[i].checked=true;
        }
    }

    document.getElementById("unSelectAll").onclick=function(){
        var checkBoxes=document.getElementsByName("cb");
        for(var i=0;i<checkBoxes.length;i++){
            checkBoxes[i].checked=false;
        }
    }

    document.getElementById("selectRev").onclick=function(){
        var checkBoxes=document.getElementsByName("cb");
        for(var i=0;i<checkBoxes.length;i++){
            checkBoxes[i].checked=!checkBoxes[i].checked;
        }
    }

    document.getElementById("firstCheckBox").onclick=function(){
        var checkBoxes=document.getElementsByName("cb");
        for(var i=0;i<checkBoxes.length;i++){
            //注意this的用法，指的是当前匿名对象
            checkBoxes[i].checked=this.checked;
        }
    }

    //鼠标移动到某行上进行变色，对每行的tr事件源进行绑定事件
    var trs=document.getElementsByTagName("tr");
    for(var i=0;i<trs.length;i++){
        trs[i].onmouseover=function(){
    //这边this的用法一定要注意，一开始写的是trs[i].className="over";这写的不对
            this.className="over";
        }
        trs[i].onmouseout=function(){
            this.className="out";
        }
    }



</script>
</html>